Edit: The Flutter team has now taken an official stance on the matter and stated that classes are preferable. See https://www.youtube.com/watch?v=IOyq-eTRhvo TL;DR: Prefer using classes over functions to make reusable widget-tree. EDIT: To make up for some misunderstanding: This is not about functions causing problems, but classes solving some. Flutter wouldn’t have StatelessWidget if a … Read more
The build method is designed in such a way that it should be pure/without side effects. This is because many external factors can trigger a new widget build, such as: Route pop/push Screen resize, usually due to keyboard appearance or orientation change The parent widget recreated its child An InheritedWidget the widget depends on (Class.of(context) … Read more
Why do I get this error? Example As a real world comparison, what just happened is this conversation: Hey, how much gas is left in the tank of the car? What are you talking about, we don’t have a car. That is exactly what is happening in your program. You wanted to call a function … Read more
In case you are familiar with Task<T> or Promise<T> and the async/ await pattern, then you can skip right to the “How to use a Future with the widgets in Flutter” section. What is a Future and how do I use it? Well, the documentation says: An object representing a delayed computation. That is correct. … Read more
The color code 0xFFfbb448 is how you define a hexadecimal color in flutter. It starts with 0x, then 2 digits that represents the opacity/transparency, and then the last 6 digits is the color code Hex #. You can get the 6 digit color code # from many sources such as https://htmlcolorcodes.com/ or https://www.w3schools.com/colors/colors_picker.asp You may … Read more
If you are using Android Studio or VS Code, you can easily use Show Context Actions by using Alt + Enter on Android Studio and right click on VS Code. Then simply click Convert to StatefulWidget.